The IPv6 tproxy patches split IPv6 defragmentation off of conntrack, but
failed to update the #ifdef stanzas guarding the defragmentation related
fields and code in skbuff and conntrack related code in nf_defrag_ipv6.c.

This patch adds the required #ifdefs so that IPv6 tproxy can truly be used
without connection tracking.

Original report:
http://marc.info/?l=linux-netdev&m=129010118516341&w=2Reported-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NKOVACS Krisztian <hidden@balabit.hu>
Acked-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NPatrick McHardy <kaber@trash.net>